Add JSONPath query input with result highlighting

[parsapanahpoor]

• Issue Title: Add JSONPath query input with result highlighting
• Description:
  Provide an input where users can type a JSONPath expression and see all matching nodes highlighted in the viewer. Optionally show the list of matches (paths/values) in a side panel.
• Tasks:
  • Add a JSONPath input UI to the component (configurable to show/hide).
  • Evaluate JSONPath expressions against the current JSON.
  • Highlight all matched nodes in the tree view.
  • Optionally show a list of matched paths/values.
  • Handle invalid JSONPath with a friendly error message.
  • Document JSONPath usage and limitations.

[github-actions]

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